Liquid-gage.



No. 890,742. Y .YPATBIIIED IIINII I6, 1908.

G. E. WHITNEY.

LIQUID GAGE. APPLIOATIQN`-IILED JULY 26.1902.

`eliamber for the water or other liquid. front of this chamber 1s Closed by a't ransparratori.

`LIQUID-GAGE A' Application med Juif/,2e

'lb n!! lello/n it Int/ 1,1 mim/rn.'

Be it known that l, tuouun E. Wui'rxm', a Citizen of the l'nited States. residing' at llast Boston, in the county of Sull'olk and State of,Massachusetts,have invented an lmprovement in Liquid-(blues,of which the l'ol-V Specification of Letters Patent.-

lowing' description, in eonneetion with the 1 aecompanying drawings. is a speeilieation, like letters on the d 'awinle's representingr like parts. Y Y

My invention eomprises a. new form of liquid gage suitable for attaehment to steam boilers and other like liquid containingy reeeptaeles. whereby the height or level ofthe liquid therein may be observed through a transparent' wall in said gage. Its object is to provide a. liquid graffe of simple construction, the appearanee oll which above the liquid level is so contrasted with its appearance below thelsanie .that lthe precise location ol` the liquid line in the Igage will be plainly discernible and unmistakable eren at a distance or in a dim light.

l`he eharaeter ol m v invention will more fulh' appear and be better understood b reference to the accompanying description and illustration Vol' one speeitie embodiment thereof.

-ln the tlra-wingsfFigure l is a. front elevation of one forni of in v improved gage; Fig. is a eentral longitudinal section of the same: and, Fig. 3 is ay cross sectional plan view taken on the. linel S--3 in Fig. t`

'lhe main body orcasing,r a is provided as shown with a recessed portion b forming a l`he ent wall e consisting' of a. plate ol' annealed tr-lass or other suitable material of sulieient thickness to withstand the necessary pressure. lbis wall is held in plaee b x' a retainim: shoulder on a cap il, suitable parking;I r c heilt;r interposed between the wall and the adjaeent. surl'ares ol the retaining shoulder and easing. 'l`he casing' rl has a projectingr lipfwhieh embraces the edges oll the cap, the latter being held in position by serews entering the easing from the rear, and fort-ing' the wall against its pat-kingl l'. `uilable passages r/ at either end of the easing" extend through tho laterally projet-till;y eonneeting portions l1. the ends of whit-h are threaded :ind provided with union nuts i whereby the gage, may be connected in any desired mannei throne-h "suitable piping with the boiler Patented June 16, 1908.

Serial No. 117,107;

or other liquid containing reeeptaele to which it is to be applied.

lt is to be understood that the size. sha )e and details ot' construction of the gage in the particulars referred to are immaterial and may be varied within wide limits to suit the `eliararter and requirements of the service to whieh it is to be applied.

IWithin the liquid chamber t1 is a reflector l.' so plaeed as to oppose a relleeting surface to the light transmitted through the transparent wall e. This retleetor l preferabl.Y form of an alumilnnn strip and polish the retlectingr surface thereof to produee a reflecting' mirroixbut my invention is not in any way limited in this respect, and au v means` providing a suitable reflecting surl'aee may be employed. By bendin f the edges of this. strip as shown seetionally in Fig. 3 ity ma)v be. plaeed in the eluunberinid frictitniallwA held therein. as shown in Fig. '2, thereby presentingtto the light ente-ring the ehaniberran oppos-in.;r eonvex retleetinpr surface. i' have. also shown the relleetor as slightly curved in the direction ot its length so that it has longitudinally, as well as laterally, a non parallel relation with the transparent wall. 'l`his non-parallel relation between the reflector andthe translmrent wall renders the-line of liquid level very distinct b v causingir the liquid in the glass to appear dark and the spaee above the liquid toappearwhite.allording a marked contrast at the liquid line. 'lhe cause for thislatter ell`eet l have assumed to lie in the ilitl'erenee between the index of refraction ol liquids, sueh as water. and of vapors, sueh as air or steam, and to the fact thatthe eritieal angle or the angle at which light is no longer rel'racted but relleeted on passin; r from one of these mediums into another such as `dass', is less in the ease of one than in the ease oll the other. l have therel'oreV assumed that the light relleeted from the 'vertieally eurved reflector meets the inner surface ol' the transparent wall at such an angle as to cause its transmission throughY thewvall or its reflection back again into the rhambel' accordingr as the interposed medium may be vapor or liquid.

lty is to be understood that the spe( iie eonst-ruetion described is submitted foi-illustrative purposes onl and that tn v invention is not in any way limited'thereto.

(`laims. 1 y

t. ln a liquid gage, a liquid chamber. a

i transparent wall'therefor and arefiecting surface within said chamber presenting a .portion inclined at an angle with said wall 1n a vertical direction.

2. In a liquidl gage, a liquid chamber, a transparent walltherefor and a laterally convex reflecting mirror within said chamber -having a surface opposed to said wall and in 5. In a liquid gage, a liquid chamber, a transparent wall therefor and a reflecting surface within said chamber, said reflecting surface and a surface of said Wall having a non-parallel relationI in a vertical direction'.

6. lIn aliquid. gage, 'a liquid chamber, a transparent Wall therefor, and a vertically curved reflector separate from the walls of said-'chamber and movably secured therein, butin a predetermined relation to said trans-l parent wall.

' 7 A liquid gage for indicating the varying level of liquids, comprising a liquid chamber having comniunicating assages and adapted for connection with a fioiler or other liquid containing receptacle, a transparent w'all therefor, and a reflecting surface chamber in close proximity and in predetermined relation to said wall, said refiecting surface, and 4a surface of said Wall being relatively curved.

| 8. In a liquid gage, a liquid chamber, a jtransparent wall therefoiyand a l fleeting surface opposed to saidA transparent wall and in Apredetermined,relation thereto.

a liquid chamber, a

convex reand a laterally 11. In a liquid gage, a liquid chamber, a Y

transparent wall therefor, and a stationary alummum reflector curved vertically .and

' tWo subscribing witnesses.

within said transversely, located'within said chamber. v 12. In a liquidl gage, a liquid chamber, a transparent wall therefor, curvedreflector in close roximity to said wall and in predetermine relation thereto, said chamber having also a liquid space behind said reflector.

'13. In a'liquid gage, a liquid chamber, a transparent Wall therefor, and a curved relector in close proximity to said wall and in redetermined relation thereto, said chamand an axially y er having also a liquid space behind said rehector.

' 14. In a liquid gage, a liquid chamber, a transparent wall therefor, and a removable curved reflector for said chamber in predetermined relation to said wall.

l ln testimony whereof, I have signed my name to this specification, 'in the presence of Witnesses:

f'lnoMAs B. TAYLOR,

Vieron LINDEROTH. 

